Dictionary (Initialize Array), C++ (gcc)

Dictionary (Initialize Array)

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//g++  5.4.0

#include <iostream>
#include <string>

class Entry
{
    private:
    int _key;
    std::string _value;
    
    public:
    Entry() {}
    ~Entry() {}
    Entry(int key, std::string value){
        this->_key = key;
        if (value.length() <= 30){
            this->_value = value;
        }
        else {
            std::cout << "String is too large.\n";
        }
    }
    
    int getKey() const { return _key; }
    std::string getValue() const { return _value; }
};

class Dictionary
{
    public:
    Dictionary()
    {
        for (int i = 0; i < 5; i++){
            Entry e;
            Entry *p = &e;
            p = NULL;
            arr[i] = p;
        }
    }
    ~Dictionary() {}
    
    void add(int key, std::string s)
    {
        Entry e(key, s);
        for (int i = 0; i < 5; i++)
        {
            if (arr[i] == nullptr) {
                arr[i] = e;
                
            }
        }
    }
    
    void remove(int key)
    {
        for (int i = 0; i < 5; i++){
            Entry e = arr[i];
            if (e.getKey() == key){
                if (i == 5){
                    arr[i] = nullptr;
                    break;
                }
                else{
                    for (int j = i; j < 5; j++){
                        arr[j] = arr[j+1]; //remove
                        break;
                    }
                }
            }
        }       
    }
    
    Entry getEntry(int key){
        for (int i = 0; i < 5; i++){
            Entry e = arr[i];
            if (e.getKey() == key){
                return e;
            }
        }
        return nullptr;
    }
            
    Entry* searchFor(int key);
    
    private:
    Entry arr[5];
};

int main()
{
    Dictionary d;
    d.add(1, "Hello");
}

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Compilation time: 0.32 sec, absolute service time: 0,4 sec

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Error(s):

source_file.cpp: In constructor ‘Dictionary::Dictionary()’:
source_file.cpp:39:20: error: no match for ‘operator=’ (operand types are ‘Entry’ and ‘Entry*’)
             arr[i] = p;
                    ^
source_file.cpp:6:7: note: candidate: Entry& Entry::operator=(const Entry&)
 class Entry
       ^
source_file.cpp:6:7: note:   no known conversion for argument 1 from ‘Entry*’ to ‘const Entry&’
source_file.cpp: In member function ‘void Dictionary::add(int, std::__cxx11::string)’:
source_file.cpp:49:24: error: no match for ‘operator==’ (operand types are ‘Entry’ and ‘std::nullptr_t’)
             if (arr[i] == nullptr) {
                        ^
source_file.cpp: In member function ‘void Dictionary::remove(int)’:
source_file.cpp:62:28: error: no match for ‘operator=’ (operand types are ‘Entry’ and ‘std::nullptr_t’)
                     arr[i] = nullptr;
                            ^
source_file.cpp:6:7: note: candidate: Entry& Entry::operator=(const Entry&)
 class Entry
       ^
source_file.cpp:6:7: note:   no known conversion for argument 1 from ‘std::nullptr_t’ to ‘const Entry&’
source_file.cpp: In member function ‘Entry Dictionary::getEntry(int)’:
source_file.cpp:82:16: error: could not convert ‘nullptr’ from ‘std::nullptr_t’ to ‘Entry’
         return nullptr;
                ^

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